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1.
A sexual act in which one man uses his erect penis to tap a second man’s testicle into a third man’s anus.

A common variant involves “removing the flag,” where a fourth man removes a dildo from the third man’s anus just as the butt-putting begins.
I thought Bruce invited me to play putt-putt golf, not butt-putt golf. That was crazy.
by ~dick April 10, 2014
 
2.
When a person spreads their ass cheeks apart and another person putts a golf ball into their ass.
Dude last night I scored three Eagles and a hole in one last night in Butt Putt Golf!
by Macgh4 December 20, 2013